Abstract: A highly flexible and hydrolysis and burst resistant, coolant conduit comprising a plurality of layers of different polymer compatible with one another at the contact surfaces of the layers, the conduit being at least partially corrugated and at least some of the individual adjacent corrugations being connected to each other by at least one crossbar or rib.

Abstract: A process for producing precondensates of partially crystalline or amorphous, thermoplastically processable, partially aromatic polyamides or copolyamides, and the use of the higher molecular weight of polyamides, accessible from the precondensates, for producing molding compositions, which are further processable by means of suitable processing techniques, involves the control of temperature and water vapor partial pressure, in a batch process.

Abstract: A method for self-crimping of S/S bi-component fibers on a fiber line includes the steps of main drawing, post-drawing on a cold drawing unit, water application in the tensed state and relaxation at the dryer inlet in the compact closed state, which results in fibers with a novel .OMEGA.-shaped crimping structure.

Abstract: A copolyamide composition and article molded therefrom, the molded article being transparent, being especially rigid, tough and cold impact resistant, having good resistance to solvents, and exhibiting negligible changes in mechanical properties in the conditioned state due to very low water absorption. The copolyamide composition including long-chain monomer building blocks and being comprised of from about 30 to about 96 parts by weight of at least one long-chain monomer which is suitable as a long-chain building block for a polyamide and which has from 9 to 12 carbon atoms; and from about 4 to about 70 parts by weight of precursor monomers for semiaromatic polyamides, which precursor monomers comprise at least one diamine, H.sub.2 N--R--NH.sub.

Abstract: The invention relates to a barrier layer resisting the transmission of oxygen for multi-layer barrier film characterized in that it is made of a transparent copolyamide comprising three components. The first component is hexamethylenediamine and adipic acid. The second component is hexamethylenediamine and azelaic acid, hexamethylenediamine and sebacic acid, and mixtures thereof. The third component is hexamethylene-diamine and isophthalic acid, hexamethylenediamine and terephthalic acid, and mixtures thereof. The total of all components is 100 mol %, and the ratio of the barrier effects in the barrier layer with respect to carbon dioxide and oxygen is at least 3:1.

Abstract: Colorless, transparent copolyamides, made up of monomers based on cycloaliphatic diamines and aromatic dicarboxylic acids and a maximum of 20 mol % of further polyamide-forming aliphatic monomers, which have glass transition temperatures of at least 175.degree. C., their blends and alloys, along with the molded articles that can be produced from them and a process for their preparation are proposed.

Abstract: A polyamide-containing polymer mixture having a melt viscosity of 1,000 to 1,400 Pa.multidot.s (at 270.degree. C. and under a load of 122.6 N) and includes the following components:(A) 50 to 75 parts by weight of polyamide 6, polyamide 6,6, polyamide 12 or mixtures thereof;(B) 15 to 30 parts by weight of a polyolefin having a density of 0.921 to 0.96 g/cm.sup.3 onto which an unsaturated carboxylic acid or an unsaturated carboxylic acid derivative has been grafted, the degree of grafting being between 0.01 and 1 weight percent, with respect to the total weigh of grafted and ungrafted polyolefin;(C) 10 to 20 parts by weight of a grafted polyolefin elastomer including at least ethylene and propylene units;(D) Additives selected from the group including stabilizers, anti-friction agents and fillers,with the sum of the parts by weight of components (A) to (D) being 100, and the mixture being produced by mixing components (A), (B) and (D) or (A), (B), (C) and (D) and extruding them at 150 to 300 rpm.

Abstract: A process for preparing linear copolyesters which contain omega-hydrocarboxylic acid units, from polyesters that contain at least 90 mol % polyethylene terephthalate units, as well as the usual amount of diethylene glycol units and possibly the known catalysts and stabilizers, includes adding to the already prepared polyester melt at least one compound of the group of lactones, optionally along with further additives but without additional catalysts in a system sealed off from gas exchange and at a higher pressure than the lactone vapor pressure in a proportion of up to 10 mol %, referred to the final melt, and mixed intensively with the melt. The resultant copolyesters, after a total dwell time of less than 30 minutes and a temperature in the range of 265.degree. to 310.degree. C.

Abstract: A process for producing bottle preforms from the melt of polyethylene terephthalate and/or its copolyesters, includes selectively introducing an inert gas into the continuous flow or partial flow of the polyester melt from a poly-condensation having an intrinsic viscosity between 0.5 and 0.75 dl/g, subsequently bringing the melt to an acetaldehyde content below 10 ppm in a melt after-condensation reactor and to an intrinsic viscosity of 0.75 to 0.95 dl/g and thereafter guiding the melt into an injection molding tool and processing same.

Abstract: The invention relates to a barrier layer resisting the transmission of oxygen for multi-layer barrier film characterized in that it is made of a transparent copolyamide comprising three components. The first component is hexamethylenediamine and adipic acid. The second component is hexamethylenediamine and azelaic acid, hexamethylenediamine and sebacic acid, and mixtures thereof. The third component is hexamethylene-diamine and isophthalic acid, hexamethylenediamine and terephthalic acid, and mixtures thereof. The total of all components is 100 mol %, and the ratio of the barrier effects in the barrier layer with respect to carbon dioxide and oxygen is at least 3:1.

Abstract: A penetration agent for elastomer reinforcement substrate contains at least one linear aliphatic monoglycide ether having at least 10 carbon atoms. Use of this penetration agent for producing elastomer-compatible reinforcement substrates avoids the use of volatile solvents and the problems associated therewith.

Abstract: Copolyamide barrier layers which are durable hot-water stable and transparent. The copolyamide is amorphous and partially aromatic, and comprises(a) 50 molar parts of substituted or unsubstituted aromatic dicarboxylic acids which are replaced by up to 60% by weight of at least one additional dicarboxylic acid selected from the group consisting of cycloaliphatic dicarboxylic acids having 8 to 24 carbon atoms, araliphatic dicarboxylic acids having 8 to 18 carbon atoms, and mixtures thereof, and (b) 50 molar parts of hexamethylene diamine, which is replaced by up to 60% by weight of at least one additional diamine, selected from the group consisting of substituted or unsubstituted aliphatic diamines having 4 to 20 carbon atoms, substituted cycloaliphatic diamines having 6 to 24 carbon atoms, araliphatic diamines having 8 to 18 carbon atoms, and mixtures thereof,the acid groups and amino groups being present substantially in equimolar proportions.

Abstract: A coolant conduit, which is an elongate tubular article for an apparatus requiring cooling by a cooling agent, includes a plurality of layers which are provided by, in combination, discharging a co-axial melt hose, 3D tubing manipulation, and blow molding thereof, each layer of the plurality being composed of a polymeric material which is thermoplastically processable. The plurality of layers preferably includes at least one inner layer which is composed of a polymeric material which is substantially inert to the cooling agent and which is substantially non-swelling; and an outer layer which is composed of at least one polyamide and which has a high pressure resistant which conveys a high bursting strength.

Abstract: A coolant conduit which is an elongate tubular article for an apparatus requiring cooling by a cooling agent, such as an engine, for example, an internal combustion engine, includes a plurality of layers which are provided by sequential coextrusion thereof and which are adjoined thereby, each layer of the plurality being comprised of a polymeric material which is thermoplastically processable. The plurality of layers may include an inner layer which is composed of a polymeric material which is substantially inert to cooling agent and which is substantially non-swelling, and an outer layer which is composed of at least one polyamide and which is pressure resistant. The coolant conduit may include a plurality of longitudinal sections, and at least one layer of the plurality of layers may then be composed of a polymeric material which differs between longitudinal sections thereof as is made possible by sequential coextrusion thereof.

Abstract: A heat-curable, epoxy-free coating system of binder resin is based on a hydroxyl-terminated polyester resin (a) with a hydroxyl number of from 20 to 200 mg KOH/g and a glass transition temperature of at least 40.degree. C., a carboxyl-group-containing, reversibly blocked polyisocyanate (b) and a b-hydroxyalkylamide (c) having at least two b-hydroxyalkylamide groups per molecule, and optionally further additives dictated by the usage and processing.

Abstract: A starch fiber produced by a spinning process and comprising:A A first amount of 1 to 100 parts of a starch melt-spinnable composition comprising1. a second amount of 56 to 96 parts of at least one modified and/or unmodified starch,2. a third amount of 4 to 40 parts of at least one destructuring agent,3. a fourth amount of 0 to 4 parts of at least one additive, selected from urea, urea derivatives, emulsifiers, lubricants, and proteins and their alkali salts,components 1, 2 and 3 totaling 100 parts; andB a fifth amount of 99 to 0 parts of at least one melt-spinnable polymer,ingredients A and B totaling 100 parts.In addition, there may also be included 0 to 20 parts of conventional additives for melt spinning compositions.The invention further relates to a process for the production of these starch fibers from this melt spinning composition, and to uses for fibers which, by modification with the starch melt-spinnable composition, have special properties.

Abstract: A process for producing a starch intermediate product in which the reactive hydroxy groups are activated by swelling and disintegrating starch with dilute aqueous-alkali lye, precipitating the disintegrated starch from an aqueous-alkali solution by adding a precipitant which is miscible with water, separating the precipitated disintegrated starch, which exists in a highly activated form, from the filtrate producing a starch intermediate product, and drying the starch intermediate product. A starch intermediate product produced by this process results in a starch which exists in a highly activated form but which is stable in storage.

Abstract: The present invention relates to water-resistant, thermoplastic starch materials processable into environmentally safe, thermoplastically produced products and cast sheets, which consist of starch acyl compounds, obtainable from high amylose starches and the derivatives thereof and being sparingly soluble in water, and of plasticizers which like ethyl citrate, glycerol acetate and lactic acid ester have a gelatinizing effect and preferably a dissolution property resulting in brilliant transparence and, as can be proved, are biodegradable.

Abstract: A starch composition including destructurized starch, an acrylate copolymer having a molecular weight of more than 400,000, water, and additives such as plasticizers, lubricants, fillers, reinforcing agents, stabilizers, impact modifiers, and flame retardants. Also disclosed are a method of preparation thereof and articles produced therefrom. The compositions are readily usable on existing devices and can be thermoplastically processed substantially in accordance with methods currently in use.

Abstract: A multilayer polymer hose or pipe conduit which contains at least one barrier layer of polyester, which acts as a barrier to fuel being carried thereby. In a preferred form of the invention, the hose or conduit has an inner polyamide protective layer, an outer polyamide protective layer, an adhesion promotor layer between the barrier layer and the inner protective layer, and another adhesion layer between the barrier layer and the outer protective layer.